When an electric current flows through a conductor it becomes hot. Why? List the factors on which the heat produced in a conductor depends, State “Joule’s Law of heating”. How will the heat produced in an electric circuit be affected, if the resistance in the circuit is doubled for the same current?

When an electric current flows through a conductor, the conductor offers some resistance for the current flow-. As a result, some electrical energy is consumed to do work for overcoming this resistance. The electrical energy consumed reappears as heat energy and the conductor becomes hot.
The heat produced in a conductor depends upon (i) the resistance R of the conductor, (ii) the amount of current l flowing through the conductor, and (iii) the time t for which electric current is flown. In this context joule derived Joule’s law of heating, according to which, the heat produced H= I²Rt
If for same current flow the resistance of the circuit is doubled then in accordance with joule’s law the amount of heat produced is also doubled.